41666991 has 4 divisors (see below), whose sum is σ = 55555992. Its totient is φ = 27777992.

The previous prime is 41666971. The next prime is 41666993. The reversal of 41666991 is 19966614.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 41666991 - 2⁵ = 41666959 is a prime.

It is a super-2 number, since 2×41666991² = 3472276277988162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41666993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6944496 + ... + 6944501.

It is an arithmetic number, because the mean of its divisors is an integer number (13888998).

Almost surely, 2^41666991 is an apocalyptic number.

41666991 is a deficient number, since it is larger than the sum of its proper divisors (13889001).

41666991 is a wasteful number, since it uses less digits than its factorization.

41666991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13889000.

The product of its digits is 69984, while the sum is 42.

The square root of 41666991 is about 6454.9973663821. The cubic root of 41666991 is about 346.6815366937.

The spelling of 41666991 in words is "forty-one million, six hundred sixty-six thousand, nine hundred ninety-one".